Improvement in millstone-dressing machines



3Sheets-Sheet 2.

. ALHOPPIN.

- MILLSTON'E DRESSING MACHINE. N'O.173, 634. Patented Feb.15,187 6.

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N.FETERS, PHG'IQLITHOGRAFHER, WASHINGTON. D. C.

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' MILLSTONE Dans MACHINE. .No. 173,634. Patented Feb. 15,, 187 6. -i

UNITED, STATES ALBERT HOPPIN, or LA OROSSE, WISCONSIN, ASSIGNORTOHIMSELF AND PATEN QFFICE.

AMAS A K. OSTRANDER, OF SAME PLACE.

IMPROVEMENT IN MILLST ONE-D RESSING MACHINES.

Specification forming part of Letters Patent No. 173.634., datedFebruary 15, 1876 application filed January 12, 1876.

To all whom it may concern: Be it known that I, ALBERT HOPPIN, of

the city and county of La Grosse and State of Wisconsin, have invented anew and Improved Millstone-Dressing Machine; and'I do hereby declarethat the following is a full, clear, and exact description of the same.

. The use of emery-Wheels for dressing mill- .tails shown in section;Fig. 2, a detail sectiona1 view on line 2 2, Fig. 3; Fig. 3, a top-planview of the entire'machine. Figs. 4 and 5 are detail sectional views onlines :10 my y, respectively, of Fig. 3. Figs. 6 and 7 are detailsectional views. I

e A represents a tubular post, hayin g a horizontalslotted'ba'se-flangaa, and adapted to be set over the eye of thebedstone,-and encircle the spindle thereof. It is provided with hingedplates at, on which set-screws a are arranged to bear, as shown, for thepurpose of leveling the post on the stone.' Atubular head, B, is fittedon said post, and from it radiates the draft-Way'O, Fig. 3, to which thechief operating parts of the machine are attached, as hereinafterdescribed. The head B turns freely on post A, but may be secured in anydesired position by means of a clampscrew, 1). The upper portion of thehead forms a bearing for the upright shaft D and the horizontal shaft E,from which latter the emerywheel derives motion. The transmission ofrotary motion from shaft D to shaft E is by ordinary bevel-gears, d 6,Fig. 1; but in order to allow the former to be adjusted higher or lower,the gear d has a spline-connection therewith. This adjustment isnecessary, owing to spindles. 'ical recess, f, which adapts it to fitand center itself upon the cock-head C, Fig. 6. The

the difl'erence in the height of different mill- The lower endof shaft Dhas a con-f shaftD is locked to the mill-spindle by a sleeve.

clutch, H, Fig. 7, so that both will rotate together. ported by a foot,and the shaft E by a stand- The outer end of the way O is supard orbracket, which rises vertically from said way. A head-block, I, Fig.3,is attached to and slides on the way 0, and is provided with suitablebearings or ways. for the .par-

allel steel bars K, to the outer ends of which .the emery-wheel isattached. These bars K. slide lengthwise in and through said heade,having a spline-connection therewith, and

provided with a hand-'wh'eel,m,01 1 its outer end. The rod is thereforeadapted to slidev through thepinion, which is fixed in the headblock I,and therefore moves bodily with it,

although arranged for being rotated independently; The shaftof'emery-wheel L is mounted iu'a long tubular bearing, M, which isarranged beneath and transversely of the bars K, and connected by hingedarms n to a frame, j M, which slides longitudinally on said bars,

and is supported thereon by friction-rollers, 0. Said wheel is supportedor held up otf the face of the stone by means of a spring, 19, whichbears against the under side of arms n, Figs. 4 and 5. r p

The tension of the spring can be regulated at will by a screw-nut, g,which is applied to the free end of a rod, 4", pivoted to the arm .9

of rock-shaft, t, the spring being interposed between said arm 8 andarms a.

The means or devices for-forcing emerywheel down into contact with thestone are a rock-bar, N, which is jointed to an arm of the tubularbearing M, and a pinion, o, operated by aT-handled shaft, P, having itsbearings in the frame M. This feature is oneof the most important partsof the invention, as .by itthe action of the emery-wheel is placed underthe perfect control of the operator, and can be moved back and forth,and also made to cut light or heavy, as desired.

A band-wheel, R, Figs. 1 and 3, having a splinc-connection with shaft E,communicates motion through belts s and pulleys t to the shaft of theemery-wheel. Said pulleys are mounted in a jointed frame, S, arrangedas,

belts, before described, to the emery-wheel. For dressing the face, asquare-faced wheel I is used, and for dressing the furrows a bevelfacedwheel is used. The stone is then stafi'ed the same as in hand-dressingwith the pick,

and the operator, taking hold of the handwheel and T-handle, beforementioned, brings the wheel to cut off the inequalities on the stone,shown by the staff, as much or little as may be required. He is thusenabled to finish the face and furrows of the stone to a point ofexcellence far beyond that heretofore attainable.

To dress the runner or upper millstone, I employ a somewhat differentapparatus. The runner is removed from the bed-stone, and

placed in an inverted position near the bed;

stone, and as nearly as practicable in' the same plane with it. Thehollow post A is taken out of the machine, and the iron block D andscrew-shaft E, Fig. 7, inserted in its place. The screw-shaft E is thenadjusted so that its point may rest in the socket of the bale F, and themachine adjusted level with the face of the inverted stone. Motion iscommuni cated to the upright shaft of the machine from the mill-spindleas follows: An upright shaft is connected to the mill-spindle by thesame arrangement of conical hole and couplings as before described, andis supported in a perpendicular position overthc spindle by a smallstand, of wood or metal. A pulley is placed upon the upper end of thisshaft, and, also one upon the upper end of the upright shaft in themachine. These are connected by a belt, and the motion of the spindle isthus imparted to the upright shaft of the machine, and from thence tothe emery-wheel, as before described.

The remaining part of the work is the same as on the bed-stone.

What I claim is- 1. The combination, with the post A, having thehorizontalflange a, of the plates 0., pivoted at the inner end by meansof hooks, and the set-screws bearing on said plates, as shown anddescribed.

2 The upright shaft D, having a conical recess or cavity in its lowerend, as shown and described,-for the purpose specified.

3. The combination of the head-block I, the

sliding bars K, emery-wheel, jointed frame S, and pulley and belt gear 8t, as shown and described.

:4. The head-block I, rack and pinion 6 ie,

the shaft E, and bandwheel R, having a splineconnection therewith, incombination with the bars K, carrying the emery-wheel L, and the beltand pulley-gear, as shown and described.

5. The emery-wheel mounted on a vertically-adjustable spring-supportedbearing, substantially as shown and described.

6. The emery-wheel mounted on arock-sh aft, M, the rack and pinion foradjusting it and controlling the pressure of the wheel upon the stone,as shown and described.

7. The spring, and its tension -regulating screw, in combination withthe rock-shaft and adjustable bearing of the emery-wheel shaft, as shownand described.

8. The emery-wheel carriage, arranged to slide on the bars K,substantially as shown and described.

ALBERT HOPPIN.

Witnesses A. K. OSTRANDER, Jr., H. I. Buss.

